A small block of mass $m$ is pushed on a smooth track from position $A$ with a velocity $\frac{2}{\sqrt{5}}$ times the minimum velocity required to reach point $D$. When the block reaches point $B$, what is the direction (in terms of angle with horizontal) of acceleration of the block ?

Q. A small block of mass $m$ is pushed on a smooth track from position $A$ with a velocity $\frac{2}{\sqrt{5}}$ times the minimum velocity required to reach point $D$. When the block reaches point $B$, what is the direction (in terms of angle with horizontal) of acceleration of the block ?

Q. A small block of mass $m$ is pushed on a smooth track from position $A$ with a velocity $\frac{2}{\sqrt{5}}$ times the minimum velocity required to reach point $D$. When the block reaches point $B$, what is the direction (in terms of angle with horizontal) of acceleration of the block ?

Q. The track shown in the figure is frictionless. The block $B$ of mass $4kg$ is lying at rest and block $A$ of mass $2kg$ is pushed along the track with some speed. The collision between $A$ and $B$ is perfectly elastic. With what velocity should the block $A$ start such that block $B$ just reaches at point $P$ ?

Q. A block of mass $M$ with a semicircular track of radius $R$ rests on a horizontal frictionless surface. A uniform cylinder of radius $r$ and mass $m$ is released from rest from the top point A. The cylinder slips on these semicircular frictionless tracks.

Q. A long block A of mass M is at rest on a smooth horizontal surface. A small block B of mass $M/2$ is placed on A at one end and projected along A with some velocity v. The coefficient of friction between the block is $\mu$. Then, the accelerations of blocks A and B before reaching a common velocity will be respectively.